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Proceedings Paper

Simple device for objective measurements of haze following excimer laser ablation of cornea
Author(s): Russell L. McCally; Bernard F. Hochheimer; Wallace Chamon; Dimitri T. Azar M.D.
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Paper Abstract

We have developed a simple instrument for making objective measurements of haze that develops following excimer laser ablation of the cornea. It consists of an appropriately modified slit-lamp microscope, with a fiber optic pickup, a filter system for wavelength selection, and a photomultiplier detector. The scattered intensity at 120 degree(s) from the forward direction is determined. Preliminary tests were made by measuring the haze following a deep photorefractive ablation on a rabbit cornea under conditions which ensured that rather severe haze would develop. The VISX Model 20/20 laser system was set to produce a 6.0 mm diameter, -15 D correction, with a central depth of 236 micrometers . Measurements were made on the normal cornea prior to ablation and at various times up to 114 days post-ablation and are compared to slit-lamp photographs. Scattering peaked two weeks post-ablation at a value approximately 40X that of the normal (unablated) cornea and gradually decreased to approximately 11X the normal value at 114 days.

Paper Details

Date Published: 24 June 1993
PDF: 6 pages
Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); doi: 10.1117/12.147535
Show Author Affiliations
Russell L. McCally, Johns Hopkins Univ. (United States)
Bernard F. Hochheimer, Johns Hopkins Univ. (United States)
Wallace Chamon, Wilmer Eye Institute, Johns Hopkins Univ. (United States)
Dimitri T. Azar M.D., Wilmer Eye Institute, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 1877:
Ophthalmic Technologies III
Jean-Marie A. Parel; Qiushi Ren, Editor(s)

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